<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
  <div id="app">
    <input type="text" v-focus>
  </div>
  <script src="./vue.global.js"></script>
  <script>
    const { createApp } = Vue;
    const app = createApp({
    });
    // 定义全局指令
    app.directive('focus', {
      mounted (el, binding) {
        el.focus()
      }
    })
    app.mount('#app')
  </script>
</body>

</html>